![]() from an area of greater concentration to an area of lower concentration, a concentration gradient is enough to drive the process. Simple diffusion is a type of passive transport that does not require the aid of transport proteins. Conversely, the uphill movement is referred to as active transport. The downhill movement of particles is called passive transport (e.g. The particles may move along or against their concentration gradient. the intracellular fluid (the solution inside the cell) and the extracellular fluid (the solution outside the cell). Image prepared by Maria Victoria Gonzaga of Biology Online Concentration Gradient and Diffusionįigure 4: In biology, a concentration gradient results from the unequal distribution of particles (e.g. Image prepared by: Maria Victoria Gonzaga of Biology Onlineįigure 3: Active transport definition and example. Image prepared by Maria Victoria Gonzaga of Biology Onlineįigure 2: Facilitated Diffusion definition and example. Figure 1: (Simple) Diffusion definition and example. Because of this, chemical energy is spent to move the particles to an area that is already saturated or dense with similar particles. This means that the particles are moved from an area of low concentration to an area of high concentration. Conversely, active transport is the transport of particles against the concentration gradient. ![]() Examples of passive transport are simple diffusion, facilitated diffusion, filtration, and osmosis. Because of the passive movement of particles no chemical energy is spent as it takes place. This means that the particles move from areas of high concentrations to areas of low concentrations. ions or molecules) are transported along the concentration gradient. In biological systems, there are two major transport phenomena: passive transport and active transport. Watch this vid on concentration gradients: This movement is an attempt to establish equilibrium and eliminate the imbalance of solute concentrations between the two solutions. This imbalance of solutes between the two solutions drives solutes to move from a highly dense area to a lesser dense area. In biology, a concentration gradient results from the unequal distribution of particles, e.g. In this regard, a concentration gradient would be the outcome when the amounts of solutes between two solutions are different. Gradient, in turn, is a term that in general refers to the progressive increase or decrease of a variable with respect to distance. In biochemistry, concentration pertains to the amount of a sub-component of a solution, e.g. water) and the solute (the particles that are dissolvable by the solvent). A solution, essentially, has two major components, the solvent (the dissolving component, e.g. Concentration gradient refers to the gradual change in the concentration of solutes in a solution as a function of distance through a solution.
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